LIST OF TABLES LIST OF FIGURES 1. INTRODUCTION Background Implementation 1 2. WELL REHABILITATION 2

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2 TABLE OF CONTENTS Page LIST OF TABLES LIST OF FIGURES ii ii 1. INTRODUCTION Background Implementation 1 2. WELL REHABILITATION Well Repair and Rehabilitation RD RD-34B 2 3. INSTALLATION OF LOW-FLOW PUMPING EQUIPMENT Removal of Existing Equipment Installation of Low-Flow Pumps Bladder Pump Installation VFD Pump Installation 4 REFERENCES 5 TABLES FIGURES i

3 LIST OF TABLES Table No. I Title Site-Wide Low-Flow Implementation Summary LIST OF FIGURES Figure No. Title 1 Well Location Map ii

4 1. INTRODUCTION This report has been prepared to summarize and describe the well equipment installation completed to implement the Site-Wide Groundwater Monitoring Program at the Santa Susana Field Laboratory (Haley & Aldrich, 2010d). 1.1 Background The Santa Susana Field Laboratory (SSFL) is located in eastern Ventura County, California (Figure 1). SSFL was established in Operations at SSFL have included chemical and engineering research, development, and testing; liquid propelled rocket engine systems and fuels research and testing; and nuclear systems research and development. Environmental investigations have shown that the groundwater beneath SSFL has been impacted by past releases from operational activities, with trichloroethene (TCE) being the chemical detected at the highest concentrations and with the greatest frequency. The monitoring program outlined in the Site-Wide Water Quality Sampling and Analysis Plan (WQSAP; Haley & Aldrich, 2010d) serves to comply with Section of the Consent Order for Corrective Action issued on 16 August 2007 (California Department of Toxic Substances Control [DTSC], 2007). The Site-Wide Groundwater Monitoring Program is separate from groundwater monitoring related to the Regulated Unit Groundwater Monitoring Programs (Haley & Aldrich, 2009a and 2009b) conducted pursuant to the conditions of Post-Closure Permits PC-94/ (Mod. SC A) and PC-94/ (Mod. SC B). DTSC indicated that wells in the Site-Wide monitoring program are to be sampled using low-flow procedures based on those described in the United States Environmental Protection Agency (EPA) document Low-Flow (Minimal Drawdown) Ground-water Sampling Procedure (Puls and Barcelona, 1996). Additional guidance was provided in DTSC correspondence (DTSC, 2008, 2010). 1.2 Implementation This report summarizes the completion of tasks to aid in implementing the groundwater monitoring program described in the Site-Wide WQSAP (Haley & Aldrich, 2010d), pursuant to the Consent Order (DTSC, 2007). These tasks include repair or rehabilitation of wells and equipping wells with low-flow pumping equipment. Work was conducted in accordance with the document Work Plan for Implementation of the Site-Wide Groundwater Monitoring Program, Santa Susana Field Laboratory, Ventura County, California (Haley & Aldrich, 2010a). Site-wide wells that are also included in the Regulated Unit Monitoring Programs were retrofitted between February through August of 2010 as described in Regulated Unit Groundwater Monitoring Program Low-Flow Pilot Test Summary, Santa Susana Field Laboratory, Ventura County, California and Summary of the Regulated Unit Groundwater Monitoring Programs Retrofit and Well Construction, Santa Susana Field Laboratory, Ventura County, California (Haley & Aldrich, 2010b, 2010c). Tasks to retrofit the remaining wells in the Site-Wide Groundwater Monitoring Program were completed from November 2010 through September The wells comprising the Site-Wide Low-Flow Implementation Program are presented in Table I. The locations of the monitor wells are presented on Figure 1. 1

5 2. WELL REHABILITATION Implementation of the Site-Wide Low-Flow Retrofit program included well rehabilitation activities of existing wells to allow for installation of low-flow pumping equipment. 2.1 Well Repair and Rehabilitation Two (2) wells were identified that required repairs prior to installation of low-flow sampling equipment. Field activities were conducted by The Boart Longyear Company (Boart Longyear) under the supervision of Haley & Aldrich staff. 2.2 RD-10 Field observations indicated the RD-10 borehole was obstructed at approximately 223 to 227 feet below the top of the well casing. The total drilled depth of well RD-10 is 400 feet. A video survey was conducted on 19 January The video survey revealed an obstruction at 223 feet. In March 2011, WDC Exploration and Wells, under the supervision of MWH, dislodged the obstruction using a heavy steel bailer. The bailer was advanced to the bottom of the well. During June 2011 low-flow equipment installation activities, an obstruction was encountered in RD-10 at approximately 227 feet. A video survey conducted on 22 June 2011 revealed an obstruction at 226 feet composed of fabric-like material from a previously installed FLUTe system. The material was removed in August Following obstruction removal, an electric submersible pump with a variable frequency drive was installed in RD-10 (Table I). 2.3 RD-34B Field observations indicated that the RD-34B well casing was obstructed at approximately 167 feet below the top of the well casing. The total drilled depth of well RD-34B is 240 feet. A video survey was conducted on 22 June The video survey revealed a partial obstruction at 167 feet below the top of casing. The nature and makeup of the obstruction could not be definitively identified. Well RD-34B is located in the undeveloped land north of Area IV. The well is located in the drainage northwest of the former Radioactive Materials Handling Facility, immediately north of a concrete spillway. Well RD-34B is isolated from direct access by the concrete surface drainage spillway. The attempts made to install a dedicated bladder pump below the partial obstruction in September 2011 were unsuccessful. Because a 1.5-inch diameter bladder pump would not pass through the partially restricted area of RD-34B, the low-flow equipment for RD-34B was redesigned to include 48 feet of 3/8- inch diameter drop intake tubing with a 2-foot-long stainless steel weight. The plan was to have the pump set above the restricted section with the narrower drop tube and intake set below in the open well. An attempt to install the re-designed system was made on 9 September 2011, but the redesigned equipment also would not clear the obstruction. Because RD-34B access is restricted by the spillway, setting up heavy equipment (either a pump rig or drill rig) next to RD-34B may damage the spillway structure. A recommendation to remove RD-34B from the Site-Wide monitoring program was made in November 2011 (The Boeing Company, 2011). 2

6 3. INSTALLATION OF LOW-FLOW PUMPING EQUIPMENT Wells at SSFL have previously been sampled using volume-purge methodology. Pumping equipment installed to support volume purging was replaced with low-flow sampling equipment, based on the EPA guidance and input from DTSC (Puls and Barcelona, 1996; DTSC, 2008, 2010). Low-flow purging methodologies and sampling protocols are described in the Field Sampling Plan (Appendix A of the Site- Wide WQSAP; Haley & Aldrich, 2010d). 3.1 Removal of Existing Equipment Volume-purge submersible pumps and associated equipment were removed by The Boart Longyear Company prior to installation of dedicated low-flow equipment. Equipment removal activities were supervised by Haley & Aldrich personnel. Materials removed from wells outside of Area IV were provided to the Boeing-contracted waste handler for disposal. Equipment removed from Area IV wells was placed on plastic sheeting, scanned for radioactivity, wrapped in plastic sheeting, and stored on-site. A second round of scanning of the Area IV equipment will be conducted in the future. Pending acceptable results of the scan, the Area IV materials will be disposed of by a Boeing-contracted waste handler. 3.2 Installation of Low-Flow Pumps Wells were retro-fitted with low-flow purging and sampling equipment, based on EPA guidance and input from DTSC (Puls and Barcelona, 1996; DTSC, 2008, 2010), and described in the Site-Wide Field Sampling Plan (Appendix A of the Site-Wide WQSAP; Haley & Aldrich, 2010d). Well equipment was selected and configured according to the Work Plan for Implementation of the Site-Wide Groundwater Monitoring Program, Santa Susana Field Laboratory, Ventura County, California (Haley & Aldrich, 2010a). Artesian wells, private wells, piezometers, seeps and springs, wells equipped with Westbay sampling systems, and wells equipped with FLUTe sampling systems were not retrofitted for low-flow sampling. Wells that are typically dry will be sampled when water is present using portable bladder pumps. At typically dry wells, dedicated tubing was installed in the well. Low-flow equipment installation information is summarized in Table I Bladder Pump Installation Bladder pumps were installed by Haley & Aldrich personnel with the pump intakes opposite the open or screened interval of selected wells. Pump intake settings are presented in Table I. Some equipment selection or pump settings varied from those indicated in the work plan (Haley & Aldrich, 2010a). Inlet extensions were installed below the pump to minimize the lift at wells RD-05B, RD-05C, RD-33C, RD-34C, RD-35B, RD-39B, RD-41B, RD-43C, RD-56B, RD-58B, and RD-58C. In wells RD-01, RD-09, RD-13, RD-18, RD-63, and RD-71 (which have open saturated intervals greater than 100 feet), a multi-port, flow-weighted inlet system (QED SpectraSample ) was installed. 3

7 3.2.2 VFD Pump Installation Electric submersible variable frequency drive (VFD) pumps installed in wells were Grundfos model Redi-Flo4 5E8. Pump intakes were generally set at the approximate mid-point of the saturated open or screened interval. Water-level-measurement access tubes were installed in the wells. Access tubes consist of 1- or 2-inch Schedule 40 PVC. Pump installation was conducted by the Boart Longyear Company under the supervision of Haley & Aldrich personnel. Pump type and setting information is summarized in Table I. 4

8 REFERENCES 1. The Boeing Company, from Michael O. Bower (The Boeing Company) to Thomas M. Seckington (California Department of Toxic Substances Control), re: RD-34B. 5 November California Department of Toxic Substances Control (DTSC), Docket No. P3-07/08-003, Consent Order for Corrective Action. 16 August , Memorandum from Thomas M. Seckington to Gerard Abrams, re: Santa Susana Field Laboratory Site-Wide Water Quality Sampling and Analysis Plan, dated December 14, October , Letter from Thomas Seckington to Michael Bower, re: Department of Toxic Substances Control Review and Comments on Draft Site-Wide Water Quality Sampling and Analysis Plan, December 2009, Santa Susana Field Laboratory. 02 November Haley & Aldrich, Inc., 2009a. Areas I & III Regulated Unit Water Quality Sampling and Analysis Plan, Santa Susana Field Laboratory, Ventura County, California. Draft 06 November , 2009b. Area II Regulated Unit Water Quality Sampling and Analysis Plan, Santa Susana Field Laboratory, Ventura County, California. Draft 06 November , 2010a. Work Plan for Implementation of the Site-Wide Groundwater Monitoring Program, Santa Susana Field Laboratory, Ventura County, California. 13 January , 2010b. Regulated Unit Groundwater Monitoring Program Low-Flow Pilot Test Summary, Santa Susana Field Laboratory, Ventura County, California. 14 April , 2010c. Summary of the Regulated Unit Groundwater Monitoring Programs Retrofit and Well Construction, Santa Susana Field Laboratory, Ventura County, California. 27 August , 2010d. Site-Wide Water Quality Sampling and Analysis Plan, Santa Susana Field Laboratory, Ventura County, California, Revison 1. 1 December Puls, Robert W., and Michael J. Barcelona, Low-Flow (Minimal Drawdown) Groundwater Sampling Procedures. USEPA Ground Water Issue EPA/540/S-95/504. April G:\Projects\26472\Reports\M-520 Site-wide LowFlow Implementation Summary\text\ HAI-SSFL_M520_site-wide_low-flow_implementation_F.docx 5

9 TABLE I SITE-WIDE LOW-FLOW IMPLEMENTATION SUMMARY SANTA SUSANA FIELD LABORATORY VENTURA COUNTY, CALIFORNIA Page 1 of 5 Well Identifier Date Retrofit Completed Low-Flow Pump Type Low-Flow Pump Model Pump Intake Setting (ft BTOC) 1 Corrected Measuring Point Elevation (ft, MSL) PZ-074 NA Portable Not Dedicated NA --- PZ-076 NA Portable Not Dedicated NA --- PZ-077 NA Portable Not Dedicated NA --- PZ-078 NA Portable Not Dedicated NA --- PZ-095 NA Portable Not Dedicated NA --- PZ-097 NA Portable Not Dedicated NA --- PZ-108 NA Portable Not Dedicated NA --- PZ-123 NA Portable Not Dedicated NA --- PZ-124 NA Portable Not Dedicated NA --- ES-01 6/30/2011 Bladder T ES-14 6/15/2011 Bladder T ES-29 6/15/2011 Bladder T RD-01 12/6/2010 Bladder * RD-02 12/7/2010 ES-VFD Grundfos Redi-Flo4 5E RD-03 4/20/2010 ES-VFD Grundfos Redi-Flo4 5E RD-05A 3/15/2010 Bladder RD-05B 4/26/2010 Bladder T RD-05C 3/15/2010 Bladder RD-06 4/22/2010 ES-VFD Grundfos Redi-Flo4 5E RD-07 NA FLUTe--- NA --- RD-09 6/28/2011 Bladder * RD-10 8/16/2011 ES-VFD Grundfos Redi-Flo4 5E RD-13 6/28/2011 Bladder RD-14 6/27/2011 Bladder RD-18 6/28/2011 Bladder * * See last page for notes and abbreviations. Haley & Aldrich, Inc. G:\Projects\26472\Reports\M-520 Site-wide LowFlow Implementation Summary\Table\ HAI-SSFL_Site-Wide_Retrofit_Summary_M520_T1_F.xlsx December 2011

10 TABLE I SITE-WIDE LOW-FLOW IMPLEMENTATION SUMMARY SANTA SUSANA FIELD LABORATORY VENTURA COUNTY, CALIFORNIA Page 2 of 5 Well Identifier Date Retrofit Completed Low-Flow Pump Type Low-Flow Pump Model Pump Intake Setting (ft BTOC) 1 Corrected Measuring Point Elevation (ft, MSL) RD-19 6/27/2011 Bladder RD-20 6/28/2011 Bladder RD-32 1/25/2011 Bladder RD-33A NA FLUTe--- NA --- RD-33B 6/29/2011 Bladder RD-33C 6/29/2011 Bladder RD-34A 6/29/2011 Bladder RD-34B TBD Bladder Pending Pending RD-34C 6/29/2011 Bladder RD-35A 6/16/2011 Bladder T RD-35B 6/30/2011 Bladder RD-37** 2/4/2010 Bladder RD-38B 4/29/2010 ES-VFD Grundfos Redi-Flo4 5E RD-39A 3/10/2010 Bladder T RD-39B 3/16/2010 Bladder RD-40 6/27/2011 Bladder T RD-41B 11/29/2010 Bladder RD-42 6/27/2011 Bladder RD-43A 3/24/2010 Bladder RD-43B 4/29/2010 ES-VFD Grundfos Redi-Flo4 5E RD-43C 3/9/2010 Bladder RD-44 1/25/2011 Bladder RD-46B 3/16/2010 Bladder T RD-48A 3/15/2010 Bladder T RD-48B 3/29/2010 Bladder T See last page for notes and abbreviations. Haley & Aldrich, Inc. G:\Projects\26472\Reports\M-520 Site-wide LowFlow Implementation Summary\Table\ HAI-SSFL_Site-Wide_Retrofit_Summary_M520_T1_F.xlsx December 2011

11 TABLE I SITE-WIDE LOW-FLOW IMPLEMENTATION SUMMARY SANTA SUSANA FIELD LABORATORY VENTURA COUNTY, CALIFORNIA Page 3 of 5 Well Identifier Date Retrofit Completed Low-Flow Pump Type Low-Flow Pump Model Pump Intake Setting (ft BTOC) 1 Corrected Measuring Point Elevation (ft, MSL) RD-48C 4/28/2010 ES-VFD Grundfos Redi-Flo4 5E RD-50 NA FLUTe--- NA --- RD-51A 3/29/2010 Bladder T RD-51B 4/30/2010 ES-VFD Grundfos Redi-Flo4 5E RD-51C 7/13/2010 ES-VFD Grundfos Redi-Flo4 5E RD-54A NA FLUTe--- NA --- RD-56A 6/16/2011 Bladder RD-56B 6/23/2011 Bladder RD-57 NA FLUTe--- NA --- RD-58B 3/11/2010 Bladder RD-58C 3/11/2010 Bladder RD-59A 6/30/2011 Bladder RD-59B NA Artesian--- NA --- RD-59C NA Artesian--- NA --- RD-60 6/15/2011 Bladder RD-61 1/19/2011 Bladder RD-62 1/21/2011 Bladder RD-63 6/28/2011 Bladder * RD-66 1/18/2011 Bladder RD-67 1/19/2011 Bladder RD-68A NA Artesian--- NA --- RD-68B NA Artesian--- NA --- RD-69 1/20/2011 Bladder RD-70 12/10/2010 ES-VFD Grundfos Redi-Flo4 5E RD-71 12/1/2010 Bladder * See last page for notes and abbreviations. Haley & Aldrich, Inc. G:\Projects\26472\Reports\M-520 Site-wide LowFlow Implementation Summary\Table\ HAI-SSFL_Site-Wide_Retrofit_Summary_M520_T1_F.xlsx December 2011

12 TABLE I SITE-WIDE LOW-FLOW IMPLEMENTATION SUMMARY SANTA SUSANA FIELD LABORATORY VENTURA COUNTY, CALIFORNIA Page 4 of 5 Well Identifier Date Retrofit Completed Low-Flow Pump Type Low-Flow Pump Model Pump Intake Setting (ft BTOC) 1 Corrected Measuring Point Elevation (ft, MSL) RD-75 12/7/2010 ES-VFD Grundfos Redi-Flo4 5E RD-76 1/19/2011 Bladder RD-78 12/1/2010 Bladder RD-81 6/17/2011 Bladder RD-83 1/20/2011 Bladder RD-85 6/27/2011 Bladder RD-86 6/27/2011 Bladder RD-96 6/29/2011 Bladder RS-18 NA Portable Not Dedicated NA --- RS-20 NA Portable Not Dedicated NA --- FDP-835 NA Spring--- NA --- FDP-890 NA Spring--- NA --- OS-02 NA Artesian--- NA --- OS-03 NA Artesian--- NA --- OS-04 NA Artesian--- NA --- OS-05 NA Artesian--- NA --- OS-09 NA Artesian--- NA --- OS-09R NA West Bay--- NA --- OS-13 NA Seep/Spring--- NA --- OS-16 NA Private Well--- NA --- OS-25 NA Private Well--- NA --- OS-26 NA Private Well--- NA --- WS-04A 7/14/2010 ES-VFD Grundfos Redi-Flo4 5E WS-09A*** NA See last page for notes and abbreviations. Haley & Aldrich, Inc. G:\Projects\26472\Reports\M-520 Site-wide LowFlow Implementation Summary\Table\ HAI-SSFL_Site-Wide_Retrofit_Summary_M520_T1_F.xlsx December 2011

13 TABLE I NOTES AND ABBREVIATIONS: Page 5 of 5 1/ = Depth to pump intake except for wells equipped with a drop tube or QED SpectraSample multi-port inlet. Note: Pump intake settings are +/- 0.5 feet. 2/ = Well is equipped with a "drop inlet" below the pump setting. Well RD-05B Pump Setting (ft BTOC) RD-05C RD-33C RD-34C RD-35B RD-39B 365 RD-41B 162 RD-43C RD-56B RD-58B RD-58C ES-VFD = Electric submersible pump with Variable Frequency Drive ft BTOC = Feet Below Top of Casing NA = Not Applicable * = Well is equipped with QED SpectraSample flow-equalization inlets at equally-spaced intervals, indicated below: RD-01 RD-09 RD-13 RD-18 RD-63 RD-71 Setting (ft BTOC) Setting (ft BTOC) Setting (ft BTOC) Setting (ft BTOC) Setting (ft BTOC) Setting (ft BTOC) Pump = 252 Pump = Pump = Pump = Pump = Pump = Port 1 = 257 Port 1 = Port 1 = Port 1 = Port 1 = 225 Port 1 = 276 Port 2 = 302 Port 2 = Port 2 = Port 2 = Port 2 = 195 Port 2 = 259 Port 3 = 352 Port 3 = Port 3 = Port 3 = Port 3 = 165 Port 3 = 242 Port 4 = 402 Port 4 = Port 4 = Port 4 = Port 4 = 135 Port 4 = 225 Port 5 = 452 Port 5 = 75.7 Port 5 = 83.4 Port 5 = Port 5 = 105 Port 5 = 208 Port 6 = 502 Port 6 = 45.7 Port 6 = 65.4 Port 6 = Port 6 = 75 Port 6 = 191 ** = Well was retrofitted as part of the Low-Flow Pilot Test *** = WS-09A will not be equipped with a low-flow pump as it is a proposed extraction well for Groundwater Interim Measures (GWIM). Haley & Aldrich, Inc. G:\Projects\26472\Reports\M-520 Site-wide LowFlow Implementation Summary\Table\ HAI-SSFL_Site-Wide_Retrofit_Summary_M520_T1_F.xlsx December 2011

14 CALIFORNIA VENTURA COUNTY OS-09 LOS ANGELES COUNTY OS-09R LEGEND SITE-WIDE MONITORING NETWORK WELL SITE-WIDE WELL INCLUDED IN POST-CLOSURE PERMIT MONITORING PROGRAM SPRING SSFL PROPERTY BOUNDARY RD-68A OS-26 RD-68B RD-56B OS-03 RD-59B OS-04 G:\Graphics\Projects\ Boeing\Misc_Maps\ SSFL-SITE-WIDE-MON-WELL-NETWORK2-DEC2011.mxd RD-33A RD-33C RD-33B RD-34A OS-05 RD-59A RD-59C RD-18 RD-34B RD-56A RD-51C RD-14 RD-51B RD-60 RD-63 RD-81 PZ-124 RD-57 RS-18 RD-07 PZ-095 RD-09 RD-20 PZ-108 RD-78 RD-35B RD-50 RS-20 RD-01 ES-14 RD-42 RD-58C WS-09A RD-67 PZ-078 RD-40 RD-58B FDP-890 RD-05B RD-05C RD-05A RD-06 RD-02 ES-01 RD-41B RD-13 RD-46B RD-44 RD-03 RD-48C RD-48A RD-32 RD-35A RD-43B OS-16 RD-43A RD-43C RD-10 ES-29 RD-54A RD-66 RD-37 PZ-097 RD-96 RD-71 WS-04A RD-83 RD-85 RD-86 RD-19 RD-34C RD-38B RD-69 RD-51A RD-39A OS-25 RD-70 OS-02 RD-39B OS-13 RD-76 PZ-074 RD-75 PZ-123 PZ-077 PZ-076 RD-61 RD-62 RD-48B SCALE IN FEET THE BOEING COMPANY SANTA SUSANA FIELD LABORATORY VENTURA COUNTY, CALIFORNIA F FDP-835 Please Note: The original version of this figure includes colorized features and shading. A black and white copy of the figure should not be used because it may not accurately represent the information presented. MONITOR WELL NETWORK, SITE-WIDE GROUNDWATER MONITORING PROGRAM SCALE: AS SHOWN DECEMBER 2011 FIGURE 1